'use client';

import * as React from 'react';
import { cva, type VariantProps } from '@/lib/cva';
import { ChevronLeftIcon, ChevronRightIcon, MoreHorizontalIcon } from '@/icons';

import { cn } from '@/lib/utils';
import { colorPalettes, disabledState, focusRing, iconSizing } from '@/lib/cva-presets';

const paginationVariants = cva('mx-auto flex w-full justify-center', {
  variants: {
    colorPalette: colorPalettes,
  },
  defaultVariants: {
    /* CBAR paints the selected page turquoise. */
    colorPalette: 'secondary',
  },
});

/*
 * CBAR draws every control in the strip at the same 32×32 — pages, arrows and
 * the ellipsis alike — rather than reusing its Button ladder, so this is a
 * local variant rather than a call into `buttonVariants`.
 */
const paginationLinkVariants = cva(
  cn(
    'inline-flex size-8 items-center justify-center rounded-md text-sm',
    'transition-colors duration-(--ui-duration-fast) ease-(--ui-ease-standard)',
    focusRing,
    disabledState,
    iconSizing
  ),
  {
    variants: {
      isActive: {
        true: 'bg-(--ctl-solid) text-(--ctl-solid-fg)',
        /*
         * Hover lands on `--ctl-soft`, a step below the selected fill. CBAR
         * draws hover identically to the resting state, which leaves a page
         * with no feedback at all before it is clicked.
         */
        false: 'bg-muted text-foreground hover:bg-(--ctl-soft)',
      },
    },
    defaultVariants: {
      isActive: false,
    },
  }
);

export interface PaginationProps
  extends React.ComponentProps<'nav'>,
    VariantProps<typeof paginationVariants> {}
export type PaginationLinkProps = {
  isActive?: boolean;
} & React.ComponentProps<'a'>;

/**
 * Page navigation.
 *
 * Renders real anchors so pages stay linkable and open-in-new-tab works. Wire
 * each link to a route or query string rather than a click handler.
 */
function Pagination({ className, colorPalette, ...props }: PaginationProps) {
  return (
    <nav
      role="navigation"
      aria-label="pagination"
      data-slot="pagination"
      className={cn(paginationVariants({ colorPalette }), className)}
      {...props}
    />
  );
}

function PaginationContent({ className, ...props }: React.ComponentProps<'ul'>) {
  return (
    <ul
      data-slot="pagination-content"
      className={cn('flex flex-row items-center gap-2', className)}
      {...props}
    />
  );
}

function PaginationItem(props: React.ComponentProps<'li'>) {
  return <li data-slot="pagination-item" {...props} />;
}

function PaginationLink({ className, isActive, ...props }: PaginationLinkProps) {
  return (
    <a
      aria-current={isActive ? 'page' : undefined}
      data-slot="pagination-link"
      data-active={isActive}
      className={cn(paginationLinkVariants({ isActive }), className)}
      {...props}
    />
  );
}

/*
 * CBAR's arrows are icon-only squares that match the page buttons. The label
 * lives in `aria-label` rather than on screen, which is why these are not just
 * a `PaginationLink` with children.
 */
function PaginationPrevious({ className, ...props }: PaginationLinkProps) {
  return (
    <PaginationLink aria-label="Go to previous page" className={className} {...props}>
      <ChevronLeftIcon />
    </PaginationLink>
  );
}

function PaginationNext({ className, ...props }: PaginationLinkProps) {
  return (
    <PaginationLink aria-label="Go to next page" className={className} {...props}>
      <ChevronRightIcon />
    </PaginationLink>
  );
}

function PaginationEllipsis({ className, ...props }: React.ComponentProps<'span'>) {
  return (
    <span
      aria-hidden
      data-slot="pagination-ellipsis"
      className={cn('flex size-8 items-center justify-center', className)}
      {...props}
    >
      <MoreHorizontalIcon className="size-4" />
      <span className="sr-only">More pages</span>
    </span>
  );
}

export {
  Pagination,
  PaginationContent,
  PaginationLink,
  PaginationItem,
  PaginationPrevious,
  PaginationNext,
  PaginationEllipsis,
  paginationLinkVariants,
};